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Infrared multiphoton dissociation spectrum of isolated protonated 1-azapyrene

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Abstract

The infrared spectrum of protonated 1-azapyrene has been obtained by infrared multiphoton dissociation (IRMPD) spectroscopy using a Fourier-transform ion cyclotron resonance mass spectrometer coupled to an infrared tunable free electron laser. Found when electrospraying a pyrene/methanol/acetic acid solution, the carrier of the dominant m/z 204 peak was determined by comparison of the IRMPD spectrum with density functional theory calculations (B3LYP/6-31G(d, p)). The greater proton affinity and solubility of 1-azapyrene explains the competitive protonation of azapyrene over pyrene despite its apparent smaller abundance in the electrospray solution. The possible contribution of 1-azapyrene to the interstellar infrared emission bands is briefly discussed. (C) 2009 Published by Elsevier B. V.

Year of Publication
2009
Journal
Chemical Physics Letters
Volume
473
Number
1-3
Number of Pages
43-48
Date Published
Apr
Type of Article
Article
ISBN Number
0009-2614
Accession Number
ISI:000265270800009
URL
PId
2b2eeb8b0493e10f5230362bf933aebd
Alternate Journal
Chem. Phys. Lett.
Journal Article
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